Late in Peter Beinart’s “The Crisis of Zionism,” the author cites a statistic that reveals much about his unsophisticated worldview. Writing about the alleged estrangement of young, American liberal Jews from the State of Israel, Beinart solemnly reports that “only 23 percent” of those who attend unaffiliated congregations “say they always feel proud of Israel.” This lack of unqualified pride, Beinart argues, is...